13400405646 has 16 divisors (see below), whose sum is σ = 26807849424. Its totient is φ = 4465628864.

The previous prime is 13400405639. The next prime is 13400405647. The reversal of 13400405646 is 64650400431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13400405647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 268341 + ... + 314336.

It is an arithmetic number, because the mean of its divisors is an integer number (1675490589).

Almost surely, 2^13400405646 is an apocalyptic number.

13400405646 is an abundant number, since it is smaller than the sum of its proper divisors (13407443778).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13400405646 is a wasteful number, since it uses less digits than its factorization.

13400405646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 586515.

The product of its (nonzero) digits is 34560, while the sum is 33.

The spelling of 13400405646 in words is "thirteen billion, four hundred million, four hundred five thousand, six hundred forty-six".